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1 : // SPDX-License-Identifier: GPL-2.0-or-later
2 : /*
3 : * Copyright (C) 2019-2023 Oracle. All Rights Reserved.
4 : * Author: Darrick J. Wong <djwong@kernel.org>
5 : */
6 : #include "xfs.h"
7 : #include "xfs_fs.h"
8 : #include "xfs_shared.h"
9 : #include "xfs_format.h"
10 : #include "xfs_trans_resv.h"
11 : #include "xfs_mount.h"
12 : #include "xfs_btree.h"
13 : #include "xfs_trans_resv.h"
14 : #include "xfs_mount.h"
15 : #include "xfs_ag.h"
16 : #include "xfs_health.h"
17 : #include "scrub/scrub.h"
18 : #include "scrub/health.h"
19 :
20 : /*
21 : * Scrub and In-Core Filesystem Health Assessments
22 : * ===============================================
23 : *
24 : * Online scrub and repair have the time and the ability to perform stronger
25 : * checks than we can do from the metadata verifiers, because they can
26 : * cross-reference records between data structures. Therefore, scrub is in a
27 : * good position to update the online filesystem health assessments to reflect
28 : * the good/bad state of the data structure.
29 : *
30 : * We therefore extend scrub in the following ways to achieve this:
31 : *
32 : * 1. Create a "sick_mask" field in the scrub context. When we're setting up a
33 : * scrub call, set this to the default XFS_SICK_* flag(s) for the selected
34 : * scrub type (call it A). Scrub and repair functions can override the default
35 : * sick_mask value if they choose.
36 : *
37 : * 2. If the scrubber returns a runtime error code, we exit making no changes
38 : * to the incore sick state.
39 : *
40 : * 3. If the scrubber finds that A is clean, use sick_mask to clear the incore
41 : * sick flags before exiting.
42 : *
43 : * 4. If the scrubber finds that A is corrupt, use sick_mask to set the incore
44 : * sick flags. If the user didn't want to repair then we exit, leaving the
45 : * metadata structure unfixed and the sick flag set.
46 : *
47 : * 5. Now we know that A is corrupt and the user wants to repair, so run the
48 : * repairer. If the repairer returns an error code, we exit with that error
49 : * code, having made no further changes to the incore sick state.
50 : *
51 : * 6. If repair rebuilds A correctly and the subsequent re-scrub of A is clean,
52 : * use sick_mask to clear the incore sick flags. This should have the effect
53 : * that A is no longer marked sick.
54 : *
55 : * 7. If repair rebuilds A incorrectly, the re-scrub will find it corrupt and
56 : * use sick_mask to set the incore sick flags. This should have no externally
57 : * visible effect since we already set them in step (4).
58 : *
59 : * There are some complications to this story, however. For certain types of
60 : * complementary metadata indices (e.g. inobt/finobt), it is easier to rebuild
61 : * both structures at the same time. The following principles apply to this
62 : * type of repair strategy:
63 : *
64 : * 8. Any repair function that rebuilds multiple structures should update
65 : * sick_mask_visible to reflect whatever other structures are rebuilt, and
66 : * verify that all the rebuilt structures can pass a scrub check. The outcomes
67 : * of 5-7 still apply, but with a sick_mask that covers everything being
68 : * rebuilt.
69 : */
70 :
71 : /* Map our scrub type to a sick mask and a set of health update functions. */
72 :
73 : enum xchk_health_group {
74 : XHG_FS = 1,
75 : XHG_RT,
76 : XHG_AG,
77 : XHG_INO,
78 : };
79 :
80 : struct xchk_health_map {
81 : enum xchk_health_group group;
82 : unsigned int sick_mask;
83 : };
84 :
85 : static const struct xchk_health_map type_to_health_flag[XFS_SCRUB_TYPE_NR] = {
86 : [XFS_SCRUB_TYPE_SB] = { XHG_AG, XFS_SICK_AG_SB },
87 : [XFS_SCRUB_TYPE_AGF] = { XHG_AG, XFS_SICK_AG_AGF },
88 : [XFS_SCRUB_TYPE_AGFL] = { XHG_AG, XFS_SICK_AG_AGFL },
89 : [XFS_SCRUB_TYPE_AGI] = { XHG_AG, XFS_SICK_AG_AGI },
90 : [XFS_SCRUB_TYPE_BNOBT] = { XHG_AG, XFS_SICK_AG_BNOBT },
91 : [XFS_SCRUB_TYPE_CNTBT] = { XHG_AG, XFS_SICK_AG_CNTBT },
92 : [XFS_SCRUB_TYPE_INOBT] = { XHG_AG, XFS_SICK_AG_INOBT },
93 : [XFS_SCRUB_TYPE_FINOBT] = { XHG_AG, XFS_SICK_AG_FINOBT },
94 : [XFS_SCRUB_TYPE_RMAPBT] = { XHG_AG, XFS_SICK_AG_RMAPBT },
95 : [XFS_SCRUB_TYPE_REFCNTBT] = { XHG_AG, XFS_SICK_AG_REFCNTBT },
96 : [XFS_SCRUB_TYPE_INODE] = { XHG_INO, XFS_SICK_INO_CORE },
97 : [XFS_SCRUB_TYPE_BMBTD] = { XHG_INO, XFS_SICK_INO_BMBTD },
98 : [XFS_SCRUB_TYPE_BMBTA] = { XHG_INO, XFS_SICK_INO_BMBTA },
99 : [XFS_SCRUB_TYPE_BMBTC] = { XHG_INO, XFS_SICK_INO_BMBTC },
100 : [XFS_SCRUB_TYPE_DIR] = { XHG_INO, XFS_SICK_INO_DIR },
101 : [XFS_SCRUB_TYPE_XATTR] = { XHG_INO, XFS_SICK_INO_XATTR },
102 : [XFS_SCRUB_TYPE_SYMLINK] = { XHG_INO, XFS_SICK_INO_SYMLINK },
103 : [XFS_SCRUB_TYPE_PARENT] = { XHG_INO, XFS_SICK_INO_PARENT },
104 : [XFS_SCRUB_TYPE_RTBITMAP] = { XHG_RT, XFS_SICK_RT_BITMAP },
105 : [XFS_SCRUB_TYPE_RTSUM] = { XHG_RT, XFS_SICK_RT_SUMMARY },
106 : [XFS_SCRUB_TYPE_UQUOTA] = { XHG_FS, XFS_SICK_FS_UQUOTA },
107 : [XFS_SCRUB_TYPE_GQUOTA] = { XHG_FS, XFS_SICK_FS_GQUOTA },
108 : [XFS_SCRUB_TYPE_PQUOTA] = { XHG_FS, XFS_SICK_FS_PQUOTA },
109 : [XFS_SCRUB_TYPE_FSCOUNTERS] = { XHG_FS, XFS_SICK_FS_COUNTERS },
110 : };
111 :
112 : /* Return the health status mask for this scrub type. */
113 : unsigned int
114 2192291174 : xchk_health_mask_for_scrub_type(
115 : __u32 scrub_type)
116 : {
117 2192291174 : return type_to_health_flag[scrub_type].sick_mask;
118 : }
119 :
120 : /*
121 : * Update filesystem health assessments based on what we found and did.
122 : *
123 : * If the scrubber finds errors, we mark sick whatever's mentioned in
124 : * sick_mask, no matter whether this is a first scan or an
125 : * evaluation of repair effectiveness.
126 : *
127 : * Otherwise, no direct corruption was found, so mark whatever's in
128 : * sick_mask as healthy.
129 : */
130 : void
131 1392239527 : xchk_update_health(
132 : struct xfs_scrub *sc)
133 : {
134 1392239527 : struct xfs_perag *pag;
135 1392239527 : bool bad;
136 :
137 1392239527 : if (!sc->sick_mask)
138 : return;
139 :
140 1391974699 : bad = (sc->sm->sm_flags & (XFS_SCRUB_OFLAG_CORRUPT |
141 : XFS_SCRUB_OFLAG_XCORRUPT));
142 1391974699 : switch (type_to_health_flag[sc->sm->sm_type].group) {
143 10183727 : case XHG_AG:
144 10183727 : pag = xfs_perag_get(sc->mp, sc->sm->sm_agno);
145 10197999 : if (bad)
146 11 : xfs_ag_mark_sick(pag, sc->sick_mask);
147 : else
148 10197988 : xfs_ag_mark_healthy(pag, sc->sick_mask);
149 10197010 : xfs_perag_put(pag);
150 10197010 : break;
151 1379841553 : case XHG_INO:
152 1379841553 : if (!sc->ip)
153 : return;
154 1379841553 : if (bad)
155 33 : xfs_inode_mark_sick(sc->ip, sc->sick_mask);
156 : else
157 1379841520 : xfs_inode_mark_healthy(sc->ip, sc->sick_mask);
158 : break;
159 691293 : case XHG_FS:
160 691293 : if (bad)
161 0 : xfs_fs_mark_sick(sc->mp, sc->sick_mask);
162 : else
163 691293 : xfs_fs_mark_healthy(sc->mp, sc->sick_mask);
164 : break;
165 89673 : case XHG_RT:
166 89673 : if (bad)
167 0 : xfs_rt_mark_sick(sc->mp, sc->sick_mask);
168 : else
169 89673 : xfs_rt_mark_healthy(sc->mp, sc->sick_mask);
170 : break;
171 0 : default:
172 0 : ASSERT(0);
173 0 : break;
174 : }
175 : }
176 :
177 : /* Is the given per-AG btree healthy enough for scanning? */
178 : bool
179 3542938170 : xchk_ag_btree_healthy_enough(
180 : struct xfs_scrub *sc,
181 : struct xfs_perag *pag,
182 : xfs_btnum_t btnum)
183 : {
184 3542938170 : unsigned int mask = 0;
185 :
186 : /*
187 : * We always want the cursor if it's the same type as whatever we're
188 : * scrubbing, even if we already know the structure is corrupt.
189 : *
190 : * Otherwise, we're only interested in the btree for cross-referencing.
191 : * If we know the btree is bad then don't bother, just set XFAIL.
192 : */
193 3542938170 : switch (btnum) {
194 673658671 : case XFS_BTNUM_BNO:
195 673658671 : if (sc->sm->sm_type == XFS_SCRUB_TYPE_BNOBT)
196 : return true;
197 : mask = XFS_SICK_AG_BNOBT;
198 : break;
199 673885674 : case XFS_BTNUM_CNT:
200 673885674 : if (sc->sm->sm_type == XFS_SCRUB_TYPE_CNTBT)
201 : return true;
202 : mask = XFS_SICK_AG_CNTBT;
203 : break;
204 674159861 : case XFS_BTNUM_INO:
205 674159861 : if (sc->sm->sm_type == XFS_SCRUB_TYPE_INOBT)
206 : return true;
207 : mask = XFS_SICK_AG_INOBT;
208 : break;
209 674068980 : case XFS_BTNUM_FINO:
210 674068980 : if (sc->sm->sm_type == XFS_SCRUB_TYPE_FINOBT)
211 : return true;
212 : mask = XFS_SICK_AG_FINOBT;
213 : break;
214 423515326 : case XFS_BTNUM_RMAP:
215 423515326 : if (sc->sm->sm_type == XFS_SCRUB_TYPE_RMAPBT)
216 : return true;
217 : mask = XFS_SICK_AG_RMAPBT;
218 : break;
219 423649658 : case XFS_BTNUM_REFC:
220 423649658 : if (sc->sm->sm_type == XFS_SCRUB_TYPE_REFCNTBT)
221 : return true;
222 : mask = XFS_SICK_AG_REFCNTBT;
223 : break;
224 0 : default:
225 0 : ASSERT(0);
226 0 : return true;
227 : }
228 :
229 3538374244 : if (xfs_ag_has_sickness(pag, mask)) {
230 0 : sc->sm->sm_flags |= XFS_SCRUB_OFLAG_XFAIL;
231 0 : return false;
232 : }
233 :
234 : return true;
235 : }
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